Sig Mosquito

[Dirtlaw]

I polished the feed ramp, cleaned the magazine spotless as well as chamfering areas of the magazine that might be binding. Also used higher velocity ammo. That appears to be the solution. Didn't want to dig for the CCI so I went with Browning BPR @ 1435 fps. Seems to work.

[DB>]

Sometimes a gun just needs a little TLC! Sounds like you got the kinks worked out and have a fun shooter now!

[A-J]

I polished the feed ramp, cleaned the magazine spotless as well as chamfering areas of the magazine that might be binding. Also used higher velocity ammo. That appears to be the solution. Didn't want to dig for the CCI so I went with Browning BPR @ 1435 fps. Seems to work.

The funniest part about shooting the CCI Stinger rounds is how F-ing loud they are. I still get funny looks from other lanes when I shoot mine. Of course, then my wife starts basting away with her 45.

[Blade Gunner]

Sig mosquitos are problematic (as are many 22 semi auto’s). They’re not even made by Sig. I had one all sorts if misfeeds and stove pipes using CCI mini mags. Polishing the feed ramp helps but it’s not a cure.I bought it to emulate firing a full sized Sig & CZ but the tigger feel isn’t even close. I bought a Sig 22 conversion slide and a CZ Kadet conversion slide. CZ conversion is the better of the two.

[manini]

Get your hands on a Ruger SR22 if you can. Similar to Mosquito but very reliable. Prices in the Marketplace have come down.

https://www.calguns.net/calgunforum/showthread.php?t=1587497&highlight=Ruger+SR22

[MyOdessa]

There is an easy fix to your Mosquito problem. Sell Mosquito, use money to buy Ruger Mk II, III or IV, or Browning Buckmark.
Your Mosquito problem is solved, enjoy your day at the range.

[jyo]

Sadly, I recommended a SIG Mosquito 22 to a family member (hey, it's a SIG right?)---the damn thing never worked well---EVER!---it was bought new, the gun store danced around the problems (constant jamming) and offered new magazines---try different ammo, etc. We went out and bought a box of EVERY 22 ammo then available including the "Gold Star" recommended CCI Mini Mags---NONE would work reliably---SIG offered to fix it and it was sent back to them---came back with more new magazines and polished feed ramp---still no good! Different springs, different ammo, different shooters---NOTHING WORKED---the pistol was dropped back into it's box and remains in a corner of the garage---maybe someone will steal it... Buy something that says Ruger or Browning on it and enjoy a day at the range...

[Dirtlaw]

Sadly, I recommended a SIG Mosquito 22 to a family member (hey, it's a SIG right?)---the damn thing never worked well---EVER!---it was bought new, the gun store danced around the problems (constant jamming) and offered new magazines---try different ammo, etc. We went out and bought a box of EVERY 22 ammo then available including the "Gold Star" recommended CCI Mini Mags---NONE would work reliably---SIG offered to fix it and it was sent back to them---came back with more new magazines and polished feed ramp---still no good! Different springs, different ammo, different shooters---NOTHING WORKED---the pistol was dropped back into it's box and remains in a corner of the garage---maybe someone will steal it... Buy something that says Ruger or Browning on it and enjoy a day at the range...

There's a fellow Calgunner looking for a 22 semi-auto. If you don't want it he may be your solution. On the other hand, he wants to use it to introduce his girls to shooting. The sig would probably be a bad introduction.

[jyo]

Hey Dirtlaw---there's nothing more frustrating than trying to teach someone to shoot than a gun that constantly jams! Shooting a 22 should be fun and relaxing, not interrupted by a gun that refuses to work... Personally, I've taught LOTS of people, young and old, to shoot and do so safely---my guns of choice for teaching is either my old Nylon 66 or a Ruger 10-22---both 100% reliable and fun...!

[Pinkie Pie]

What pythonfan said. I got one cheap from a buddy and made a mission to fix it up. I got mine running with other ammo usually, but only on CCI minimags are 100% (or very close to it). If you want to improve it, do your research.

I have heard many others say the Sig Mosquito prefers the CCI minimags over all others. I have a Sig Mosquito new in the box but have never fired it as I also have a S&W 617-4 10 shot revolver that is so accurate and sweet to shoot I just have never un-boxed the Sig. Being a revolver the 617 handles anything.

[deckhandmike]

Sell it to one of these guys that say no guns are finicky. https://www.calguns.net/calgunforum/....php?t=1588443

They can fix anything with there mad skills, lol.

[Raiderh20boy]

I guess it just luck of the draw. Love my Mosquito using CCI MiniMags. It's almost 2 years now. I shoot it every Sunday during the NFL off-season 50-100 rounds before moving on the my CCW stuff. Haven't had any problems. I also have the GSG FireFly that gets out of the safe about once a month for my grandson. We clean after each Range session, don't skimp on oil and ready to go for the next time. Also have a GSG 1911 with a BUNCH of mods that my son likes to get in our family competitions. Everything is stripped when we get home and throughly cleaned. NO ISSUES !! We only use CCI MiniMag.

[A-J]

The mosquito likes to be well lubed and have good high velocity ammo. Bear in mind that HV ammo is not the same between manufacturers.

Remington Golden bullet 40gr High Velocity is rated at 1255 FPS
CCI Stinger High velocity is rated at 1640

I've never had an issue with anything rated at 1400 FPS and I've put a couple thousand rounds through mine now.

Sadly, my brother's Walther will eat any rounds he puts in it and fire every time. His gun was less expensive too. Dammit!

Hey Dirtlaw---there's nothing more frustrating than trying to teach someone to shoot than a gun that constantly jams! Shooting a 22 should be fun and relaxing, not interrupted by a gun that refuses to work... Personally, I've taught LOTS of people, young and old, to shoot and do so safely---my guns of choice for teaching is either my old Nylon 66 or a Ruger 10-22---both 100% reliable and fun...!

I quoted myself just to reinforce the solution.